Shalom: Knightmare III

In this game, you play the role of a Japanese high-school student, the leader of computer club. Above all, you like playing games. One day, you and your girlfriend are playing a game and suddenly get teleported into the game world. This is a fantasy world that resembles ancient Greek civilization. Before long you realize that you are in fact a hero who must save this world from the evil Gog, an ancient demon awaiting resurrection, otherwise you won't ever be able to return home.